you beat the elite four first and rayquaza, groudon and kyogre will turn shiny
No that is wrong you cant just beat the elite four an then the legendary Pokemon will turn shiny you either have to use a cheat system like action replay or GameShark or as soon as you get to the legendaries save your game an if the Pokemon is not shiny reset you game repeat this until it is shiny
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its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
go to the last floor of sky pillar(you need a mach bike).save it and fight raquaza.if rayquaza don't shiny,reset your game until you get rayquaza shiny.
get rayquaza
Well, you can but it will take forever.. Anyways this is what you need to do: Go to Sky pillar, then when you get to Rayquaza "SAVE" then battle Rayquaza... If its not black then you need to turn off the game and turn it on again until it turns shiny. Every .9 pokemon are shiny, so this may take you 20,000 tries.
equip rayquaza with rare candy